Legacy Data System Reference - Comtech EF Data

12.1.2 Port speed (bps)
12.1.3 Clocking mode
SE/PORT Configuration Parameters
Console SNMP Text-based Config
Port speed (bps) ifwanSpeed-bps [ifwan#] Speed-bps
The internal speed of the port. Speeds up to 2 Mbps are supported on a WAN link (port set
in PVCR; no compression), Frame Relay, SDLC, HDLC or PPP port.
However, when a serial port is configured with other protocols, the highest attainable
speed is less than 2 Mbps. For example, PASSTHRU data is transmitted at a maximum of
128 Kbps.
NOTE: The Port Speed parameter is not used for a port in external clocking. It is also
not required for a digital channel.
Values: 1200 - 128000
Default: 56000
Console SNMP Text-based Config
Clocking mode ifwanClocking [ifwan#] Clocking
This parameter determines the clock source for the port. For all protocols except T-
ASYNC, R-ASYNC and asynchronous PPP, the clock source is automatically controlled
by the NetPerformer. For the asynchronous ports, this parameter can be used to specify a
physical clock source, using internal or external isochronous clocking. In isochronous
mode, the time intervals between significant actions or signals are either equal in duration
or are whole multiples of the shortest time interval detected.
Here are the possible settings for ports configured with any protocol except the
asynchronous protocols (T-ASYNC, R-ASYNC and asynchronous PPP):
• INTERNAL: For a DTE interface, the unit supplies a clock signal on RS-232D
pin 24 (V.35 pins U-W) and uses this clock to transmit data. The unit also accepts
a clock signal on RS-232D pin 15 (V.35 pins V-X) to clock the received data.
For a DCE interface, the unit provides two independent clock signals: one on RS-
232 pin 15 (V.35 pins V-X) to clock the data going out and one on RS-232 pin 17
(V.35 pins Y-AA) to clock the data coming in.
• EXTERNAL: For a DTE interface, the unit accepts two clock signals: one on
RS-232 pin 15 (V.35 pins V-X) to clock the received data and one on RS-232 pin
17 (V.35 pins Y-AA) to clock the transmitted data.
For a DCE interface, the unit accepts one clock signal on RS-232 pin 24 (V.35
pins U-W). This clock signal is used to clock both transmitted and received data
and is returned on RS-232 pins 15 and 17 (V.35 pins V-X and Y-AA).
Memotec Inc. 12-3